海上超深钻孔灌注桩试桩施工工艺

Test Pile Construction Technology for Super-deep Bored Piles in Sea-water

杭州湾跨海大桥南岸滩涂区钻孔桩试桩直径1500mm,桩长87m,杭州湾地质条件复杂,受潮汐,风力等自然条件因素影响较大,工期要求紧迫,在地表以下100m范围内富含浅层天然气。该工程有四大特点:风大,浪高,冲刷大,水流急。叙述了钻孔灌注桩试桩的施工工艺和取得的经验。

The construction of Cross-sea Bridge at Hangzhou Bay is characterized with strong winds, high waves, heavy scouring and quick torrents. In spite of the complicated geological conditions with abundant natural gas at levels within 100 m depth and the influence of the natural forces such as tides and winds, the construction has a tight time schedule. Based on the construction of bored piles with a diameter of 1 500 mm and a length of 87 m at the southern bank, the test pile construction technology and the experience gained for bored piles are introduced.